While we do have Shadow Floppers, Shadow Stones would be great to have environmentally, and Chrome Splashes and Chrome prefabs could open the possibility for a variety of different experiences with how the Chrome mechanics work.
#Shadow Stone consumable and Chrome Splashes/Galleries
elder fog
mellow sapphire
If chrome did come into the game we would need the prop manipulator or something to enable/disable chrome on certain surfaces, if they didn't do that they could leave the map.
hollow dome
Should be easy enough to implement, it's the same situation as fire
distant cargo
for uefn specifically, it could likely be a physical material that u can apply to materials